Guard for powder actuated tool



April 22, 1958 R. T. CATLIN ET AL GUARD FOR POWDER ACTUATED TOOL 2 Sheets-Sheet 1 Filed Aug. 24, 1955 FIE'J w W N LO N im M R m u W Ha T n R R T u 8 n. 00 r R H. Y I B If I" n v I z Z O0 u 0 0. 0 al 0 r o a I .0. 0 1 v 00 I.

a 9 n I A o a r April 22, 1958 R. T. CATLIN ET AL 2,831,192

GUARD FOR POWDER ACTUATED TOOL Filed Aug. 24, 1955 2 Sheets-Sheet 2 INVENTOR. ROBERT 7." CA TL/N ROBERT Tu? TON GUARD FOR POWDER ACTUATED TOOL Robert T. Catlin, Trumbull, and Robert Turton, Fairfield, Conn., assignors to Remington Arms Company, Inc., Bridgeport, Conn., a corporation of Delaware Application August 24, 1955, Serial No. 530,252

4 Claims. c1. 1-44.s

This invention relates to explosively actuated tools, 'particularly tools of the. type adapted to propel fastening devices; into difiicultly penetrable materials such as aged concrete and steel.

More specifically, the invention contemplates a missile guard of a type adapted to be effective when a stud is to be driven into a relatively confined space which does not admit a guard of conventional type. .T'Ihe guard of this invention is especially adapted to enterchannels of varying width and depth, locating the muzzle of the tool, properly guarded, within such channels in position to project a stud through a foot at the endof-the channel and integral therewith. Such channels, comprising inturned edges defining slots of varying width, are in common use as a base for door frames and are known in the building trade as door bucks. The present invention is especially adapted to driving a stud through a foot projecting outwardly from the back of a door buck and is adapted to use on door bucks having openings of several different widths.

In the drawings:

Fig. 1 is a sectional elevation of a guard embodying the present invention, together with a fragmentary section of the part of the tool to which the guard is secured and a fragmentary section of a typical door buck, the tool being shown in firing condition.

Fig. 2 is a plan view of the guard in operative relation to a typical door buck.

Fig. 3 is a plan view of the lower plate of the guard, showing its adaptation to door bucks comprising openings of varying width.

The guard is adapted for attachment to a fastener driving tool of the type shown in the patent to Walker, No. 2,645,772, July 21, 1953, or of the type shown in the pending application of Walker et al., S. N. 517,192, filed June 22, 1955. These tools comprise a barrel extension secured to a guide tube 11. The construction of the tool as described in said patent and pending application is such that to enable firing the barrel must be projected forward relative to the guide tube to approximately the position illustrated in Fig. 1. Guide tubes and barrels are interchangeable, as described in the prior art, and the present invention contemplates integrating with a guide tube such as 11 the guard devices to be described.

The guard comprises an upper plate 12, which may be described as a square with symmetrical notches cut from two adjacent corners to define a tongue or projection 121, apertured to receive the mouth portion 131 of a short sleeve 13 which is rigidly secured to the periphery of an aperture 122 in plate 12 by suitable means such as welding or brazing. The end portion of guide tube 11 is received in sleeve 13 and rotatably held therein by suitable means, such as studs 111 projecting into an annular groove 132. The body of the tool is of such width that it cannot enter the mouth of the door buck or other channel W (Fig. 2), hence, the sleeve 13 is inclined to the plane of the plate 12, instead of being perpendicular thereto, so that when the projection 121 is placed in the 2,831,192 Patented Apr. 22, 1958 relation to the work illustrated in Fig. 2 the guide tube projects diagonally outwardly and upwardly, emerging from the channel and enabling the body of the tool to be located outside the channel. Since the foot W of the work to be penetrated by the fastening device is of steel, the amount which the guide tube and stud delivering barrel therein can depart from a perpendicular to the plane of said foot is limited. Too great an angleof inclination causes the stud to bend or fishhook, instead of penetrating the work. The maximum permissible angleof deviation of the barrel axis from the perpendicular has been found to be about 10. Up to this angle of inclination, the stud is properly received and driven into the host material.

As shown in Fig. 2, the projection 121 of plate '12 which carries the sleeve 13 is of such width that it will just enter the narrowest channel mouth for which the guard is designed, and thus serves to locate the driven stud substantially midway between the flanges, of the channel, also midway between the margins of foot W Means are provided for similarly locating the guardwith respect to channels of other widths, which may be constructed as follows:

A lower plate 15 is pivoted at the center of the 'mutilated square of upper plate 12. The pivot means may comprise a stud or boss 14 secured to the lower plate,

extending upwardly through a short sleeve 16 securedin an aperture in upper plate 12 and terminating in a knurled head or fingerpiece 17. Suitable means, such as coil spring 18, draws the two plates into facial contact while enabling their separation for a purpose to be described.

The lower plate 15 has the configuration illustrated in Fig. 3, comprising a plurality of projections 151, 152, 153 and 154, of varying width adapted to enter the mouths of channels of corresponding width. The narrowest projection 151 has a width substantially equal to the width of projection 121 of the upper plate 12 and as seen in Fig. 2 is in registry therewith. Each projection comprises an aperture 19 adapted to be brought into registry with the aperture 122 in upper plate 12 in which the guide tube receiving sleeve 13 is secured. It will be seen that when projection 151 is in registry with projection 121 the assembly is adapted to enter and locate the barrel within the channel having a relatively narrow mouth, as shown in Fig. 2. When it is desired to use the tool in a channel having a mouth of greater width, say a width equal to that of projection 152, lower plate 15 is rotated to bring the aperture 19 in such projection into registry with aperture 122; thus affording a proper guide in another size channel. The same is true of projections 153 and 154, said projections being of progressively greater width than the projection 152. The lower plate is located in any one of a plurality of desired positions relative to the upper plate by suitable means, such as a locating stud 20 secured in upper plate 12 and provided with an enlarged head 21 adapted to enter any one of the four apertures 19 in plate 15. To select a diflferent projection on plate 15 for use, said plate is depressed relative to plate 12 until head 21 clears the upper surface of plate 15 by thrusting downwardly on fingerpiece 17, after which plate 15 can be rotated relative to plate 12 to the desired new position.

Preferably there is secured to the underside of lower plate 15 a sheet or pad 22 of resilient missile stopping material, such as rubber, foam rubber, neoprene and the like, which serves to retard or stop fragments which may be dislodged in the driving of the stud. Short posts 23 may depend from upper plate 12 adjacent the two corners of said plate remote from projection 121, as an aid to leveling the guard when pad 22 overlies a workpiece such as foot W What is claimed is:

1. In a tool for explosively driving a fastening device, a guard associated with the barrel of said tool, said guard comprising an upper plate having a projection thereon for entry into a work recess, said projection having an aperture therein, tool mounting means on said projection comprising a barrel sleeve on said upper plate surrounding said aperture and extending upwardly at an angle less than 90 to the plane of said projection, a lower plate pivotally joined to said upper plate, said lower plate comprising a projection having an aperture therein registerable with the projection and aperture of said upper plate by pivotal movement of said lower plate.

2. A tool according to claim 1, in which said lower plate comprises a plurality of projections of varying predetermined width, each projection comprising an aperture disposed to be brought into registry with the aperture in said upper plate by pivotal movement of said lower plate,

whereby the muzzle of said tool may be accurately located by said projectionsin work recesses having openings of "varying width.

3. A tool according to claim 2', including means for locating said lower plate relative to said upper plate with one of :said projections of the lower plate in registry with vfor pivotal and axial movement, said lower plate being ,4 axially movable from facial engagement with said upper plate to separate said stud and said aperture and thereby permit pivotal movement ofsaid lower plate.

4. In a tool for explosively driving a fastening device, a guard associated with the barrel of said tool, said guard comprising an upper plate having thereon a coplanar pro jection of predetermined width for entry into a work recess, said projection having an aperture therein, a sleeve mounted on said projection peripherally to said aperture and extending upwardly at an angle of less than 90 to the plane of said projection, a tubular barrel extension coaxially mounted in said sleeve, means on said barrel extension for coaxially receiving the barrel of said tool, a lower plate pivotally mounted on said upper plate, said lower plate having a plurality of projections thereon of varying predetermined widths, each projection comprising an opening disposed to be brought into registry with the aperture in said upper plate by pivotal movement of said lower plate, each of said lower plate projections by its predetermined width accurately centering said sleeve and said coaxial tool barrel in a different width work recess when said aperture and said opening are in registry.

References Cited in the file of this patent UNITED STATES PATENTS 1,388,363 Miller Aug. 23, 1921 2,189,439 Temple Feb. 6, 1940 2,648,840 Farnsworth et a1 Aug. 18, 1953 2,673,980 Ballachey Apr. 6, 1954 2,679,645 Erickson June 1, 1954 

